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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Date: Fri, 27 May 2022 19:40:08 +0530
Subject: [PATCH] ASoC: qcom: lpass-platform: Update VMA access permissions in
mmap callback
[ Upstream commit ef8d89b83bf453ea9cc3c4873a84b50ff334f797 ]
Replace page protection permissions from noncashed to writecombine,
in lpass codec DMA path mmp callabck, to support 64 bit chromeOS.
Avoid SIGBUS error in userspace caused by noncached permissions in
64 bit chromeOS.
Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@quicinc.com>
Link: https://lore.kernel.org/r/1653660608-27245-1-git-send-email-quic_srivasam@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/qcom/lpass-platform.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/qcom/lpass-platform.c b/sound/soc/qcom/lpass-platform.c
index 74d62f377dfddcba14610e876055dfbe43c29558..ae2a7837e5ccf198dbd302edf38f4dfc6e51602f 100644
--- a/sound/soc/qcom/lpass-platform.c
+++ b/sound/soc/qcom/lpass-platform.c
@@ -898,7 +898,7 @@ static int lpass_platform_cdc_dma_mmap(struct snd_pcm_substream *substream,
struct snd_pcm_runtime *runtime = substream->runtime;
unsigned long size, offset;
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
size = vma->vm_end - vma->vm_start;
offset = vma->vm_pgoff << PAGE_SHIFT;
return io_remap_pfn_range(vma, vma->vm_start,
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